<template>
  <section class="todoapp">
    <!-- 除了驼峰, 还可以使用-转换链接 -->
    <TodoHeader :list="list" ></TodoHeader>
    <TodoMain :list="showList" @del="delBtn"></TodoMain>
    <TodoFooter @changeType="changeTypeFn" :type="getSel" :len="showList.length" @clearTask="clearFn"></TodoFooter>
  </section>
</template>

<script>
// 1.0 样式引入
import "./styles/base.css"
import "./styles/index.css"
    
import TodoHeader from "./components/TodoHeader";
import TodoMain from "./components/TodoMain";
import TodoFooter from "./components/TodoFooter";


export default {
  components: {
    TodoHeader,
    TodoMain,
    TodoFooter,
  },
  data() {
    return {
      // list: [
      //   { id: 100, name: "吃饭", isDone: true },
      //   { id: 101, name: "睡觉", isDone: false },
      //   { id: 102, name: "打豆豆", isDone: true },
      // ],
      list: JSON.parse(localStorage.getItem('todolist')) || [],
      getSel: 'all'
    };
  },
  computed: {
    showList() {
      if(this.getSel === "yes") {
        return this.list.filter(item => item.isDone)
      }else if(this.getSel === "no") {
        return this.list.filter(item => !item.isDone)
      }else {
        return this.list
      }
    }
  },
  methods: {
    changeTypeFn(type) {
      this.getSel = type
    },
    clearFn() {
      this.list = this.list.filter(item => !item.isDone)
    },
    delBtn(id) {
      this.list = this.list.filter(item => item.id !== id)
    }
  },
  watch: {
    list: {
      deep: true,
      handler() {
        localStorage.setItem('todolist', JSON.stringify(this.list))
      }
    }
  }
};
</script>